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infrabony pocket (intra-alveolar pocket) (intrabony pocket) a periodontal pocket in which the bottom is apical to the level of the adjacent alveolar bone.
periodontal pocket a gingival sulcus that extends abnormally deep into the periodontal ligament apically to the original level of the resorbed alveolar crest.
suprabony pocket (supracrestal pocket) a periodontal pocket in which the bottom is coronal to the underlying bone.
su·pra·bon·y pock·et(sūpră-bōnē pokĕt)
Periodontal opening extending apically by ending above adjacent alveolar bone crest.